Details

Autor(en) / Beteiligte

• Canassa, V.F.
• Baldin, E.L.L.
• Lourenção, A.L.
• Barros, D.R.P.
• Lopes, N.P.
• Sartori, M.M.P.

Titel

Feeding behavior of Brevicoryne brassicae in resistant and susceptible collard greens genotypes: interactions among morphological and chemical factors

Ist Teil von

• Entomologia experimentalis et applicata, 2020-03, Vol.168 (3), p.228-239

Ort / Verlag

Amsterdam: Wiley Subscription Services, Inc

Erscheinungsjahr

2020

Quelle

Access via Wiley Online Library

Beschreibungen/Notizen

• The cabbage aphid, Brevicoryne brassicae (L.) (Hemiptera: Aphididae), is distributed throughout the tropical and subtropical areas of the world. The main crops attacked by B. brassicae are cabbage, collard greens, broccoli, Brussels sprouts, and cauliflower. To survive the attack of pest insects, plants have evolved various resistance mechanisms that may affect pest feeding behavior. The use of electronic monitoring through EPG (electrical penetration graph) can help characterize and distinguish the resistance mechanisms involved. This study evaluated the feeding behavior of B. brassicae in eight genotypes of collard greens, Brassica oleraceae L. var. acephala (Brassicaceae), exhibiting antixenosis and/or antibiosis resistance to this insect. Possible correlations were established between the glucosinolate levels, the hardness, and the epicuticular wax on the leaves vs. aphid feeding behavior. On the genotypes 22V, 5E, and 27VA, for which many ‘potential drop’ waves were performed, aphid development was slower, indicating antixenosis as resistance type. Aphids on the genotypes 22V and 24X required more time until accessing the phloem, also suggesting antixenosis as resistance category. Genotypes 22V and PE had hard leaves, which also points at antixenosis. Genotypes 20T and HS had higher total wax and wax mg−1. Feeding parameters on ARI and 24X were similar to those observed on HS; antibiosis is likely to be the predominant resistance category of this germplasm. Because HS was considered as a susceptible standard genotype in this study, a higher gluconapin amount indicates that this compound does not influence cabbage aphid feeding behavior. The present study confirms that analysis of the physical and chemical aspects of collard greens genotypes by the EPG technique can provide a useful approach for the study of plant resistance to cabbage aphids. We evaluate cabbage aphid, Brevicoryne brassicae (Hemiptera: Aphididae), feeding behavior in collard greens, Brassica oleraceae var. acephala (Brassicaceae), genotypes that exhibit antixenosis and/or antibiosis resistance, quantify the leaf hardness and glucosinolate and wax levels, and establish possible correlations with resistance categories. Physical and chemical analyses of the genotypes and application of the EPG technique were shown to be useful in studies of host plant resistance to cabbage aphids in collard greens genotypes.